pH值和阴离子对TiO₂水悬浮液中邻甲基苯甲酸多相光催化降解的影响。
The pH and anion effects on the heterogeneous photocatalytic degradation of o-methylbenzoic acid in TiO2 aqueous suspension.
作者信息
Wang K H, Hsieh Y H, Wu C H, Chang C Y
机构信息
Department of Environmental Engineering and Health, Yuanpei Institute of Medical Technology, Hsinchu, Taiwan, ROC.
出版信息
Chemosphere. 2000 Feb;40(4):389-94. doi: 10.1016/s0045-6535(99)00252-0.
This investigation used UV light of 365 nm and titanium dioxide in aqueous suspension to study the photocatalytic reaction of o-methylbenzoic acid under the influence of pH values, anion additives and the varieties of titanium dioxide. From experimental results, under the condition of 5 g/l TiO2, pH 3 and light intensity of 2.45 mW/cm2, 0.1 mM of o-methylbenzoic acid could be completely decomposed in 2 h. The reaction was faster with lowering pH, and was found to be apparent first-order following Langmuir-Hinshelwood model. In the presence of anion additives, the inhibitive effect of chloride ions was larger than that of sulfate ions under acidic condition for Degussa brand titanium dioxide, but without influence using Janssen brand. Both brands, however, promoted the mineralization of o-methylbenzoic acid (o-MBA).
本研究使用365 nm的紫外光和水悬浮液中的二氧化钛，研究了在pH值、阴离子添加剂和二氧化钛种类影响下邻甲基苯甲酸的光催化反应。实验结果表明，在5 g/l TiO₂、pH 3和光照强度为2.45 mW/cm²的条件下，0.1 mM的邻甲基苯甲酸在2小时内可完全分解。随着pH值降低，反应速度加快，根据朗缪尔-欣谢尔伍德模型，该反应表现为明显的一级反应。在阴离子添加剂存在的情况下，对于德固赛品牌的二氧化钛，在酸性条件下氯离子的抑制作用大于硫酸根离子，但使用杨森品牌时无影响。然而，两个品牌都促进了邻甲基苯甲酸（o-MBA）的矿化。
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